Did you end up finding a solution to this problem?
If I had to implement a fix to prevent tickets from being created in this
situation, I'd probably try to handle it at the MTA level and not pass such
emails to rt-mailgate in the first place.
However, I'd probably try to solve this first by
What is the scope of your definition of outside RT?
RT has a command line interface, and you can also run Perl scripts on the
RT host that interact directly with RT's library code to achieve tasks.
One example of an operation that can be run directly on the RT host is this
script, which resets
If your users require facilities beyond just creating and replying to their
own tickets, I would recommend setting those users up as within some group
rather than just privileged/unprivileged. Then, you can simply use
rights/permissions to decide what is or isn't available to that group (and
